关键词: 
反应显微谱仪 /
飞行时间 /
定标器 /
PXI /
FPGA

摘要: 介绍了一种基于PXI总线的高精度、多通道定标器。可测量脉冲信号的最高重复频率为100 MHz，最高计数可达240。定标器有2种工作模式：定时计数模式和精确触发测量模式。定时计数模式工作在低计数率下(s 1 MHz)；精确触发测量模式可以工作在高计数率下(~ 100 MHz)，可以满足兰州反应显微成像谱仪实验中对定标器的要求。基于可编程逻辑器件FPGA进行设计，使之变得灵活，方便进行升级和改造。This article introduces a high resolution and multi-channel scaler based on PXI-3U standard. The maximum repetition frequency of the input signal is 100 MHz, with a counting scale up to 240. This scaler is able to operate in two working modes: counting within a certain time period or between two adjacent input trigger signals. The rst mode is designed for a low counting rate (~ 1 MHz), while the second mode for a high rate ( 100 MHz). Test results indicate that this scaler has a good performance, beyond the application requirement in the experiment of the reaction microscope at Lanzhou (ReMiLa). Besides, with the application of Field Programmable Gate Array (FPGA), this scaler module is exible and convenient to be upgrade in future.